Too much Perl 6

So, yesterday I was giving a quick perl workshop using Catalyst. The idea was to write a blog in 3 hours. At some point I wrote the following code:

sort { (stat $_)[10] } glob 'posts/*';

And it didn't work, because Perl 5 doesn't DWIM when I have a sort routine that takes only one parameter, while Perl 6 would realize that and use that value for a later sorting. Basically, Perl 6 implemented the schwartzian transform in its core.